X11: Fix application of window size limits

Closes #805.

README.md

@@ -105,6 +105,8 @@ information on what to include when reporting a bug.
  - [GLX] Bugfix: Dynamically loaded entry points were not verified
  - [EGL] Added `lib` prefix matching between EGL and OpenGL ES library binaries
  - [EGL] Bugfix: Dynamically loaded entry points were not verified
+ - [X11] Bugfix: Fixed window size limits being ignored if window minimums or
+                 maximums were set to GLFW_DONT_CARE
 
 
 ## Contact
@@ -244,6 +246,7 @@ skills.
  - Santi Zupancic
  - Jonas Ådahl
  - Lasse Öörni
+ - Warren Hu
  - All the unmentioned and anonymous contributors in the GLFW community, for bug
    reports, patches, feedback, testing and encouragement
 

src/x11_window.c

@@ -229,6 +229,22 @@ static void updateNormalHints(_GLFWwindow* window, int width, int height)
                 hints->max_height = window->maxheight;
             }
 
+            if (window->minwidth != GLFW_DONT_CARE &&
+                window->minheight != GLFW_DONT_CARE)
+            {
+                hints->flags |= (PMinSize);
+                hints->min_width = window->minwidth;
+                hints->min_height = window->minheight;
+            }
+
+            if (window->maxwidth != GLFW_DONT_CARE &&
+                window->maxheight != GLFW_DONT_CARE)
+            {
+                hints->flags |= (PMaxSize);
+                hints->max_width = window->maxwidth;
+                hints->max_height = window->maxheight;
+            }
+
             if (window->numer != GLFW_DONT_CARE &&
                 window->denom != GLFW_DONT_CARE)
             {